Commit 3. -Finished I3 of tutorial

app/assets/javascripts/tags.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/tags.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the tags controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/tags_controller.rb

@@ -0,0 +1,17 @@
+class TagsController < ApplicationController
+
+  def index
+    @tags = Tag.all
+  end
+
+  def show
+    @tag = Tag.find(params[:id])
+  end
+
+  def destroy
+    @tag = Tag.find(params[:id])
+    @tag.destroy!
+
+    redirect_to tags_path
+  end
+end

app/helpers/articles_helper.rb

@@ -1,7 +1,7 @@
 module ArticlesHelper
 
   def article_params
-    params.require(:article).permit(:title, :body)
+    params.require(:article).permit(:title, :body, :tag_list)
   end
 
 end

app/helpers/tags_helper.rb

@@ -0,0 +1,2 @@
+module TagsHelper
+end

app/models/article.rb

@@ -1,3 +1,20 @@
 class Article < ApplicationRecord
   has_many :comments
+  has_many :taggings
+  has_many :tags, through: :taggings
+
+  def tag_list
+    tags.join(', ')
+  end
+
+  def tag_list=(tags_string)
+    tag_names = tags_string.split(",").collect do |s|
+      s.strip.downcase
+    end.uniq
+    new_or_found_tags = tag_names.collect do |name|
+      Tag.find_or_create_by(name: name)
+    end
+    self.tags = new_or_found_tags
+  end
+
 end

app/models/tag.rb

@@ -0,0 +1,9 @@
+class Tag < ApplicationRecord
+  has_many :taggings
+  has_many :articles, through: :taggings
+
+  def to_s
+    name
+  end
+
+end

app/models/tagging.rb

@@ -0,0 +1,4 @@
+class Tagging < ApplicationRecord
+  belongs_to :tag
+  belongs_to :article
+end

app/views/articles/_form.html.erb

@@ -12,6 +12,10 @@
       <%= f.label :body %> <br />
       <%= f.text_area :body %>
     </p>
+    <p>
+      <%= f.label :tag_list %><br/>
+      <%= f.text_field :tag_list %>
+    </p>
     <p>
       <%= f.submit %>
     </p>

app/views/articles/index.html.erb

@@ -9,4 +9,4 @@
   <% end %>
 </ul>
 
-<%= link_to "Create a new article", new_article_path, class: "new_article"%>
+<%= link_to 'Create a new article', new_article_path, class: "new_article"%>

app/views/articles/show.html.erb

@@ -1,4 +1,10 @@
 <h1><%= @article.title %></h1>
+<p>
+  Tags:
+  <% @article.tags.each do |tag| %>
+    <%= link_to tag.name, tag_path(tag) %>
+  <% end %>
+</p>
 <p><%= @article.body %></p>
 
 <%= link_to 'Edit Article', edit_article_path(@article) %>

app/views/tags/index.html.erb

@@ -0,0 +1,9 @@
+<h1>All Tags</h1>
+
+<ul id="tags">
+  <% @tags.each do |t| %>
+    <li><%= link_to t.name, tag_path(t)%></li>
+  <% end %>
+</ul><br/>
+
+<%= link_to 'Home', articles_path %>

app/views/tags/show.html.erb

@@ -0,0 +1,9 @@
+<h1>Articles by Tag <%=@tag.name%></h1>
+
+<u1>
+  <% @tag.articles.each do |article|%>
+      <li><%= link_to article.title, article_path(article) %></li>
+  <%end%>
+</u1>
+
+<%= link_to 'Delete Tag', tag_path(@tag), method: :delete, data: {confirm: 'Are you sure it is wise to delete this tag?'} %>

config/routes.rb

@@ -4,4 +4,5 @@
   resources :articles do
     resources :comments
   end
+  resources :tags
 end

db/migrate/20170807120329_create_tags.rb

@@ -0,0 +1,9 @@
+class CreateTags < ActiveRecord::Migration[5.1]
+  def change
+    create_table :tags do |t|
+      t.string :name
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20170807120429_create_taggings.rb

@@ -0,0 +1,10 @@
+class CreateTaggings < ActiveRecord::Migration[5.1]
+  def change
+    create_table :taggings do |t|
+      t.references :tag, foreign_key: true
+      t.references :article, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170806133537) do
+ActiveRecord::Schema.define(version: 20170807120429) do
 
   create_table "articles", force: :cascade do |t|
     t.string "title"
@@ -28,4 +28,19 @@
     t.index ["article_id"], name: "index_comments_on_article_id"
   end
 
+  create_table "taggings", force: :cascade do |t|
+    t.integer "tag_id"
+    t.integer "article_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["article_id"], name: "index_taggings_on_article_id"
+    t.index ["tag_id"], name: "index_taggings_on_tag_id"
+  end
+
+  create_table "tags", force: :cascade do |t|
+    t.string "name"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
 end

test/controllers/tags_controller_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class TagsControllerTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/fixtures/taggings.yml

@@ -0,0 +1,9 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  tag: one
+  article: one
+
+two:
+  tag: two
+  article: two

test/fixtures/tags.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString

test/models/tag_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class TagTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/models/tagging_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class TaggingTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end